Burner control means



March 10, 1953 J. A. CERNY ET AL BURNER CONTROL MEANS 4 Sheets-Sheet 1 Filed Aug. 31, 1946 \NVENTORS: JOSEPH A. CERNY 2 NOEL B. GREEN BY w.

March 10, 1953 J. A. CERNY ETAL BURNER CONTROL MEANS 4 Sheets-Sheet 2 Filed Aug. 31, 1946 INVENTORS'.

V W W R R E 0 CR GmT A. A W EEfi 5 0M J BYf March 10, 1953 J. A. CERNY ETAL 2,630,850

' BURNER CONTROL MEANS Filed Aug. 31, 1946 4 Sheets-Sheet a Q iv FIG-1O a PILOT ROOM MAIN VALVE THERM. VALVE 40 93 J 5a 50 mh'a wau I D F T 4 FIG. 11 J I 1.0- 36 QQAQQJ FIG. 5

INVENTORS. 51

JOSEPH A. CERNY 50 Non. B GREEN 6: :3 7?

A TQB March 10, 1953 J. A. CERNY ETAL 2,630,860

BURNER CONTROL MEANS Filed Aug. 31, 1946 4 Sheets-Sheet 4 FTG. 1E

1NveN-roRs: JOSEPH A. CERNY Norm.v B. GREZEN BY [V a n ATTOI%EY Patented Mar. 10, 1953 UNITED; STATES? PATENT F E-IaCEYl assignments to:Afiiliated ,Gas Equipment, Inc.,. Cleveland, i Ohio,: a.gcorp0ratio,n of Delaware ApplicatiomAugustSl, 1946, Serial -N0.r69.4;268 1 6 Claims; (Cl. 158-124) This invention relates tocontrol meana and more particularly to pilot means for controllot gas burners Broadly,- the --invention comprisesa pilot de vicefor such purposes, having a number of J fea.-. tures'of novelty, the features beingemployable in various combinations; and the pilot being-employable in a variety of'novel circuits made-pos sible thereby;

Briefly, the invention"contemplates- -theprovi-- sion 'of a; starting pilotas auxiliary to the main safetyyorservicepilot-heretofore known in theart ignition of theburner to be served; from eitherpilotc electric-ignition-for the starting pilot; ignition -of the safety pilot from the starting- -pilot and means-thermally responsive to both 'pilots for pilot controlas well as control of the burner; as will appear.

Direct advantages therefrom;- and important objects-pf the invention; include: first, protection of---the- 'ignition' coil fromprolonged operation ofthepilot "which it immediately serves; with-consequent"increaseof--coil life and--possible faster starting by employment-of more starting pilot gas-than would otherwise be permissible}. and secondly, optional provision'that upon safety pilot outage, either all feel including pilot fuel is cut off, or the safety-pilot is-automatically relit so thatmain burner operation is resumed.

A notable resultant object-f the inventiomis the provision-ofelectric- :or automatic ignition; with remote" controlif desiredpfltogether with complete shutdownoffpi'lotfas, well as -main burner upon pilot outage.

Further, objects and advantages will be tap- 1 parent from the following description'taken "in connection with; the; accompanying drawings whereinxFigs; 1 and 2am from and side elevate. tions respectively of a {pilot device embodying certain features of' the invention, adapted-for operation. with electric 'automaticignition; by remote control, partsbeing broken away to'show details of construction.

Fig. 3 is 'a detail showing :certainparts ap: pearing; in'Fig, 1, and Fig. 41s a view'of the same partsas from the' right-Fig; 3;"-

Fig's. 5and 6 are views-correspondingtoFigs; 1 -and "2; but illustrating'a -modifiedpilot device provid-ing 'complete gasshutdown on-pilot *outapplication: thereof not; involving its eleptri'mige nition.

2," Figs; 10 and 11. are iwiring diagram and Loomposite schematic views respectively, together -illustrating a mannen of; employment I of an embodiment of; the pilotrdevice, including both its;

electric structure as; illustrated .,,in,- Figs .1 towel and its additionalfeatures as illustrated 4 in Figs, 5 =to,.:.8,-, and in; particular the-valve structure soft. theqlatter figures, to provide ,-(a) full automatic. mainburner. operation, includin i-101i lighting-, responsive to remotev thermostatic control,-4b,): complete, automatic shut down-of; all gas {to-both pilotzrand main burner: tuponpilot outage and (c) automatic re-oestablishment of, operation; uponpilot outage duringicallforbeatby the re-; mote control.

Fig 1211s, a composite schematicwiewrillustrat ing. another-manner of employmentrof the same pilot embodiment indicated; in.- Figs.T 105' and; 11. and; providingjnitial; establishment; of,=theg pilot flame. manually; by push button; control ,which may be remote :from;;bo.th:the thermostatic con,- troller :and :thepilot itself, and automatic, :shut. down of' allf. gaseupon cpilot outage;

In ;the drawings the same referenoewcharace ters-areapplied-tothe. same or equivalentv parts.

With-:referencemow to ,the-,.drawi-ngs; and first toiFigs. 1 to; 4-thereoiz I is; an;:elongated base:.;member;-generallymi channel section with its web memhereAJ-somee what L. tapering-l A,-;-, thermally; responsive a unit generally indicated and I1; isrdisposed withinw the. hollowlof thepbasegmeanss I; the thermally re,-v sponsive unit; beingpf ;oelongated .iormeand disl-g posed: generally:within;.thashollow -o thebase means, .withhone end'isecured-itoi one-10f the-flange membersi of,thebasewmeansaat.the;smalleriend oithe base, its; other :enchbeingaadaptedxto have thermally responsive:stroke; between the-gflan e ziandithe opposite; flange=;3 10f atheqbase adjacent the. other end thSIfiQfiQCIQSISWiSEzgOf. the basesiweb member 4; V

More particularly the thermally; -responsi.v.e unit .is itself; generallyvofichanne-l:form; witha pair of: spaced leg-members I i; and; lzfiinterconnected by spaced :web means..;l 2a; :at- 'oneziedgeirof the unit, following-the teachings of, PatentlzNio. 2,455,,3 0.6,1 issued November: 30, i19f18flt0ffFI31-Qk 5R: Higley, the legomem'beri l l beingvtheifcoldc mem; ber ofthepain andthat whiciiis securedztogthe web member 22 :of: :the.;:;base',-. and othelrgothenrleg member; being :the; ffhot, leg member; of the -pair as will appear.;

, A; switch blookaassembly. including ablock5'20 ofv insulating material is; mounted-lat the-- larger end of thebase means, l as by bolts at .2[,jtolex-1 tendsbetweenthe flange members 2 andl3 .ofth

base adjacent the moving end of the thermally responsive unit ill, as a closure for that portion of the hollow of the base. The flange members 2 and 3 as shown Figs. 1 and 3, may be partially cut away adjacent the switch block, and a, cover 22 provided to complete the enclosure.

The switch block 20 carries a pair of stationary contactors at 23 and 24, having associated binding posts 25 and 26 to which they are respectively connected by the straps indicated in Fig. 2, and another pair of binding posts 27 and 28. The contactors 23 and 24 have contact faces at the inner face of the block, and are located in spaced relation transversely of the base means i. A moving contactor I3, having flexible connection I4 with the binding post 28, is carried by the corresponding end of the unit it for thermally responsive movement between its cooperative stationary contactors 23 and 24, to effectively connect either binding post 25 or 26 with the binding post 28.

More particularly for the purpose, the contactor I3 is mounted in an insulator [5 which in turn is carried by a loop It in a wire spring member having an offset portion i'i between the leg members H and I2 of the thermally responsive unit 10, a straight portion 18 extending along the unit, to an offset base portion 19 extending through and slightly beyond an opening in the member l2a of the unit, as indicated in full lines Fig. 3 and broken lines Fig. 4. The leg members H and I2 of the latter, adjacent the offset il in the wire, are brought together as indicated in Fig. 4, to just clear the wire; the arrangement being such that the assembly of the wire in the thermally responsive unit is made simply by inserting the wire end through the hole in the unit, after which, in the complete assembly, the spring arm portion l8 bears at its upper extremity, Figs. 1, 3, and 4, against the back of the web member 120. of the thermally responsive unit, to in turn bear the moving contactor 13 against its cooperative fixed contactor 23 or 24; the leg members II and I2 of the thermally responsive unit meanwhile locating the moving contactor strokewise of the unit while permitting sprung motion of the contactor to establish and maintain contact.

' For actuating the thermally responsive unit by heating of its leg l2, pilot burner means including a pilot stem 30 are provided. This pilot burner as here illustrated extends from a fitting 3|, being secured therein by a screw 32 passing through a bracket 33 welded to the near flange 3 of the base I, the burner having further support from a bracket 34 also secured to the same flange member 3. The fitting 3| may be provided with a central restricted gas orifice, indicated in Fig. 2, and the side-air inlet indicated in Figs. 1 and 2 so as to produce a gas-air mixture within the pilot burner 30, when gas is admitted from the line to which the fitting has connection in service.

The pilot burner 30 is generally closed at its far extremity but there has porting generally indicated at 35, including a port portion 35a directed toward the hot leg 12 for energization of the thermally responsive unit, a port portion 35?; adapted to be directed toward the burner to be served, and a slot 350 interconnecting the port portions 35a and 35b as a third port portion, so that in effect all three port portions act as a single porting 35, with coincident operation. The upper portion of the near flange member 3 of the base I is cut away as appears in Fig. 2, adjacent the end of the pilot'burner stem 30, so

4 as not to interfere with operation of its porting.

For ignition for the pilot burner 30, a coil 46 may be located between the pilot burner stems 30 and 33, mounted in a ceramic coil block 4!, carried by the bracket 33 with insulated leads 42 and 43 leading from its opposite ends through the block M to the binding posts 25 and 21, the flange 3 of the base i being cut away to clear the leads as indicated in Fig. 2. Cooperative with the ignition coil 40 is a porting 35d in the pilot burner 30, and preferably a shield 44 is. arranged to protect the coil and assist in ignition by defleeting discharge from the port 35d. The arrangement is such that the porting at 35d. is effectively a fourth part of the porting at 35a, 35b, and 350, so that the entire porting will have substantially simultaneous ignition from the coil 40, when the latter is energized and fuel is supplied to the pilot burner 30.

From what has thus far been described, the arrangement of parts may be seen to provide that in cold or off position, which is that illustrated, contact is made between movable contactor l3 and stationary contactor 23; and when ignition is had at the pilot burner 30, as by energization of the coil 40, the leg l2 of the thermally responsive unit If), receiving heat by way of the port portion 35a, will expand and cause the thermally responsive element to move to the right, Fig. 2, carrying the contactor l3 off the contactor 23 and onto the contactor 24, igniting energization of the coil 40 being had by way of binding post 28, flexible connection Hi, movable contactor l3, fixed contactor 23, binding post 25, lead 42, to the coil 40, and return through lead 43 to binding post 21. When the moving contactor has been shifted to hot or on position, the contactor 13 being ofi the contactor 23, the coil is automatically de-energized and a connection is established from binding post 28, by way of flexible connection 14, movable contactor l3, stationary contactor 24, and to binding post 26.

In short, the switch means illustrated and described constitutes a single pole, double throw switch arranged for actuation by the thermally responsive unit 10,

It will be apparent therefore that the pilot device, as thus far disclosed, is employable to serve a main burner, as a safety pilot with either manual or automatic electric ignition under remote control, as is well known in the art.

Examplesof such employment widely known in the gas heating industry are fully disclosed in the following patents: 2,176,647, October 17, 1939, Thomson, Fuel Igniting Device for Burners; 2,192,632, March 5, 1940, Beam, Burner Control System; 2,231,986, February 18, 1941, Beam, Ignition System for Burners; 2,275,279, March 3, 1942, Beam, Automatic Lighter.

According to this invention, a second pilot burner stem 36 is disposed alongside and mounted similarly to the pilot burner stem 33.

As will be appreciated by one familiar with the art, such second pilot burner 36 might, with suitable porting, be employed either as a simple flare or escapement pilot, or in the absence of the above described electric ignition, as a constant pilot as hereinafter appears in connection with Fig. 9.

However, according to this invention the pilot burner 33 may be arranged to have its ignition from the pilot burner 30, be effective on the thermally responsive unit it, and in igniting relation to the main burner to be served.

acaogsea:

Tosuchpurpose; 'as-illustratedin Figs? land 2; I the pilot burnertdis ported to include a-port portion 36a to receive ignition from the pilot burneriifi'; a port-portion-Blib adapted to be in igniting relation to a main burner to be served,-'- 5- and a slotportionttc interconnectingthe portions 353a and-35b, so that all'three port portions of the pilot'burner stem 36- act-as a single porting,- with coincident operation; As'will be more fully described hereinafter ill-COIlIlEGtiOn with--Fig.- 7,"

ignition-between the two pilot burners 30 and 36- is here indicated as had by way of the'portportion 35aof the starting-pilot burner 30 and the: port portion 38a of the running pilot burner-66 these two port portions both being directed toward'the-sa-me portion of the thermally responsive unit Hito be effectivethereon.

By thisrelation between the two pilot burners 30 and-36, it will be apparent that the burner-30L may serve the burner 35, the burner 30havingelectric ignition and serving merely as a starting pilot,-- and the burner deserving asa running safety pilot; so that upon-ignition of the-running pilot by the starting pilot, operation-of the starting pilot may terminate and its --ignition= coil thus saved from-exposure to heat and-com bustion products-during the running period.

As already-suggested above, .the pilot device may be employedwithout electric ignition, with the pilot burner Sdserving as a safety pilot, .re-

ceiving itsignition from the pilot burner .36 and being efiective onthethermally responsive unit it, and the pilot burner 36 servingas a constantpilot,.for ignition of .the main burner'to be served and of the safety pilot: burner 33, and-preferably without. being effective upon the thermally -responsive unit; the two pilot burners-being suitably ported for suchpurpose, as WBIIUIldGIStOOd; in..the.art. Such. arrangement is indicated in Fig.9 wherein A is the main burner to be served, 5t ispits solenoid valve; in: circuit with the contactor. 24 (described. in connection withFi'g. 2 and there illustrated), 5! is amanualya'lve cone. trolling, gas supply to bothpilct stems, and 52 is a:magnetically or otherwise electrically motor.-- ized :valve, in the. .gas ..line .from .the. valve .51.. to the safety pilot stem 3%); and in circuit.with;.a; room thermostat. I

In this, application of the pilot, on? operation.- of the main burner .Awill be. BISQfOHQWSyaSSUmF ing, the .valve 5 i, open;. the pilot .burner 3B .::in operation as a constant pilotgand the, safety-pilot valve 52 closed. Energization ofytheyalvei52kas responsive to room thermostat call for. heat.;ad=. mitsgas to the safety pilot30, wh.ich-.is,promptly, r7 ignited from theconstant pilot 3fiflservinggasxits. lighting-pilot- This heats, the thermally respon; sive unit It to make contact at24 andopemthe main gas valve 58 to admit. gasto the burner A, which is. promptly ignited from'eitheror both' pilot stems.

Upon outage of the safety. pilot36; either accidentally or by de-energization of. the room thermostat circuit to close-the valve 52, the main burner. will be promptly shut down by breaking of its solenoid circuit at the contactor 24. 65

With reference now-to Figs. 5 to 8 of the draW-.- ings, an important modification or second form. of the pilot device itself is illustrated. The as: sembly of the base I, thermally responsive unitl0,-and switch parts2B-is, retained asillustrated and'described inconnectionywith Figs; 1 130.;4; However,:;a different-pair of pilot burner .stems. is: substituted, for those -.previously' disclosed, and a:

valve issadded-iftin controLlofaione ofxt thespilot 75 6 homer-stems responsive to .thethermallyzresponegsive'unit; as will appears The ignitioncoil might be retained-in the assembly of Figsrdto 8 :gen-J- erally as before, but for clarity is omitted from: these figures of the drawings.

In this modification two pilot burner stems. 60? and 66 are mounted in the bracket 33 generallyi: as before, except that a block :3 I a; having through openings as indicated in'Fig. 6, is employed im place of the 'fittings3 I of-the preceding forms.

Further in this-modification the pilot burner 60 is to serve as a running safety pilot, and the" burner 66 as a starting-or lighting pilot therefor, each preferably in igniting relation to the burner to be served, and each pilot-effectively'in igniting relation with the other. Moreover, the thermally responsive unit lflis actuable responsive to either or'both pilots, and may serve to effect such ignit ing relation therebetween.

For these purposes," the safety pilot burner-'60 is [provided with porting as illustratedin Figs- 5; 6, and 7, generally indicated at 6l' and including a port portion fila'direc'ted toward the'hot'le'g 12 'ofthe thermally responsive unit Ill; an op positely directed port portion Elb adjacent the upperextremity ofthe stemyto be in-igniting re-- lation to the burner to be served, and a slot'por-- tion Bic interconnecting theport portions 61a and 6th; so that all threeportions of the portingwill act coincidently as asingle port: The starting pilot burner 66 is provided with generally similar porting 6i, including-a port- 'portiont'iaat the same elevation as'the port portion 61a of the saftypilot, and directed to the hot leg l2 of the thermally responsive unites a-target common to both pilotsythe portingalso including a port portion 67b adapted to serve thesame" burner served by the port portion 6!?) of :thepilot burner and a slot portion 61c interconnectingthe portions 61a and 61b for-00inch dent operation thereof.

The arrangement is such that the unitrlflwill be responsive to flame from either "the 'port6'lof the starting pilot 'orthe port portion-6m of the safety pilot, and ignition at theporting 6! may be had'from the porting 61 becauseof impingement from both,'at the same'location-on face of the hot leg l2.

Valve means are provided forrcontrol of the safety pilot tdqsuch means'including a body 'lfl: The valve body Hl-ismounted on the assembly by the screw. 2 I; which also serves in 'securementof'the switch block 20, and by -the screw"?! in the'bracket 33.

The-valve body'lil carries spuds i2 andi'l2aslightly spaced from the "pilot-burner stemsgfifl and- 65 respectively, with orifices" directed therealong so thatyair-injection and mixing will "be accomplished on gas discharge: r Opposite the spuds the valve body is provided withthreaded inlets 73 and "13a to receive fittings-for gas supply tubing. For-the starting pilot burner 66 the'valve body is provided Witha through passagefrom inlet m te spud 72' as indicated'in-Fig'd- Forthe spud 12a of the-safety'pilot burner 60f howevery automatic thermally'responsive valve means are provided, eiiectivebetweenits inlet 53a andspud 12a."

Details of the valve itself are immaterial here,

but appear "-in-Fig; 8, the valve including -an 0 orifice at surrounded by an annular recess"'|5,.

a diaphragm it secured by the annular-retainer TI, anda-ba-lh'lfi adaptedto bear the diaphragm-- it" against =the annular-seatbetween the orifice 'M andspace l5 to-cIo'se -the valverormermit raising ofvthe diaphragm from-itsrseat-toperirnit flow between the orifice I4 and the annular space 15. Suitable passageways, as indicated in broken lines in Figs. 5 and 6, are provided in the valve body 10, leading to the safety pilot 69 from its inlet 13a, by way of the port M and annular space to its spud 12a, subject to control of the ball 18.

For control of the valve, a bell-crank lever gen erally indicated at 8I3 is provided, pivotally mounted at 89 and having an arm 8| carrying an adjustment screw 82 engageable with the ball I8 to yieldably maintain the valve in closed position. The bell-crank has another arm 83 alongside the body 70, which latter is recessed to receive a spring 84 to yieldably urge the ball-crank toward valve closing position.

It will be apparent that the valve may be opened manually by depression of the bell-crank lever arm 83.

Means are provided, however, for automatic control of the valve responsive to the thermally responsive unit [9. For such purpose the lever arm 8! is provided with an extension having a cam part Bla, engageable by the unit ii. to move the bell-crank lever in valve opening direction, as the unit 10 moves to on position responsive to pilot flame. The extension has its extremity 8lb disposed to bear against the thermally responsive unit when the latter has attained on position, without exerting a force thereagainst tending to move the unit in the direction of its stroking. Thus with reference to Fig. 8, wherein the thermally responsive unit i9 is shown in off position, in moving to the right to on position, when energized by heating of its leg 22, the unit will first engage the cam part am of the arm but will ride from the cam part onto the straightened part 8111 before completion of its on stroke. In other words, the cam part 81a serves in opening the valve and the part Bib serves thereafter in holding the valve open.

While not specifically illustrated in Figs. 5 to 8, it will be apparent that if desired the electric ignition parts disclosed in connection with Figs. 1 to 4 may be applied to the modification of Figs. 5 to 8, with provision of an igniting port cooperative with the ignition coil '39, in the starting pilot burner 66, similar to the port 35:1 in the burner 30, Figs. 1 and 2. For such purpose, of course, the parts actuated by the thermally responsive unit I D are so proportioned and arranged that during the on stroke of the unit, the safety pilot valve will be opened by engagement of the cam part 81a to admit gas to the safety pilot, before the contactor I3 is moved off the face of the contactor 23.

, As indicated in Fig. 12 such arrangement permits electric starting ignition under push button control, with complete automatic shutdown upon pilot outage, together with on and off main burner operation responsive to a remote room thermostat. In Fig. 12, as indicated, the switch part of the combined push button valve and switch 98 is in the circuit of the ignition coil 49 subject to the binding post 25 of the switch contactor 23, the transformer 9i constituting the source of electricity. 'The room thermostat 92 is in circuit with the binding post 26 of the contactor 24, which circuit also includes the main burner valve 50 as well as the transformer 9|.

Operation in this arrangement of Fig. 12 will be as follows: To start, depression of the push button at 99 admits gas to the starting pilot 55 and coincidently energizes the ignition coil 40 to ignite the gas. Operation of the starting pilot energizes the thermally responsive unit H] to admit gas to the safety or running pilot 60 through opening of its automatic valve and shifts the contactor l3 to de-energize the ignition coil and establish the main burner valve circuit which includes the room thermostat. The push button may then be released, operation of the safety pilot having been established. Thereafter the safety pilot 60 serves also as a constant pilot, leaving the main burner operation subject to the room thermostat 92 for its on and off operation, and igniting the main burner when gas is admitted thereto. Upon outage of the safety pilot 60, however, through the action of the thermally responsive unit, its own gas is cut off and the main burner valve circuit is broken.

As indicated in Figs. 10 and 11, full remote control, including automatic pilot ignition and reignition, with complete gas shutdown upon pilot outage may be had with the second form of the device.

In this arrangement the motor means of an electrically motorized pilot valve 93 is placed in the circuit of the room thermostat 92, the latter being in the circuit of the binding post 28 of the thermally responsive switch means, the transformer 91a. having a double opposed output, with one secondary in the circuit of the pilot valve 93 and binding post 25, and having the other secondary which is in out of phase relationship with the first, in circuit with the main burner gas valve 50 and ignition coil 40, the room thermostat 92 being in both circuits, all as shown in Figs. 10 and 11.

In this arrangement on operation will be as follows: Commencing with call for heat by the room thermostat 92, the motor means of pilot valve 93 is energized to admit gas to the starting pilot 6S, and coincidently the ignition coil 40 is energized, each circuit being served by its part of the transformer am, the room thermostat 92 being in its common branch of both circuits.

Operation of the starting pilot 66 energizes the thermally responsive unit to admit gas to the safety pilot 60 by opening of its automatic valve, and throws the thermally responsive switch to de-energize the ignition coil and also tie-energize the pilot valve 93, thus shutting down the starting pilot. Throwing of the switch places the main burner valve 50 in circuit for energization and de-energization responsive to the room thermostat 92, with main burner ignition from the safety pilot 69 acting as a constant pilot.

Upon outage of the safety pilot 6!), the room thermostat 92 is relieved of control of the main burner valve 59, and put in control of the pilot valve 93. If the room thermostat is not calling for heat at the time, all gas is shut off pending such call. If and when the room thermostat calls for heat, the lighting cycle described above is repeated. Thus if pilot outage occurs while the room thermostat is calling for heat, automatic relight of both pilot and burner follows.

It is to be noted that in any of the above described applications wherein a lighting pilot is itself electrically ignited to serve another pilot, either constant, safety, or otherwise relatively a running pilot, the lighting pilot is energized only for a very short period. This permits use during such period of a relatively unlimited amount of pilot gas, resulting in quick ignition from the coil; whereas in the prior art, in order to save the coil from flame impingement after ignition, it has been necessary to employ only a minimum of gas in the pilot burner served by the coil.

, Moreover, where ignition of the safety pilot energization.

Also it is notablethat where a starting pilot is employed as described for ignition of a running pilot, both pilots are in igniting relation to the main burner served and controlled by the pilot device, to insure burner ignition coincident with supply of 'burnergas. Thus rin practice,

both running pilot and mainburner may have simultaneous gas supply and simultaneous ignition from the starting'pilot.

Likewise, where the described thermally re- =sponsive pilot valvei lemployed for'automatic shutdown ofthe running pilot upon pilot outage,

its mechanicalactuation byv the thermalunit it) makes its. operation independent of failure of -"*electricalicircuits normally under pilot control.

:':In"-conclusion, it will be observed that the complete-pilot device itself includes: essentially tricsignition is, provided in a circuit including the switch, the pilot burners being related with 'eachother by porting, providing ignitionbetween tl'iem and at least one of them being ported for energizingrelation-i to the thermally responsive unit.

The invention also embraces a number of novel .andiimproved control circuits made possible by :the novelty of the combination of the pilot device.

The pilot device is equally employablein nurmerous known circuits not requiring all of the :elementsof-its complete combinationgwhich elezments, therefore, may be selectively omitted'from the device; the only changes therein, in addition to such omissions, comprising of porting of the pilot burner or burners suitable to the manner of service of the device in the intended control I circuit, such porting being of elementary nature within the purview of anyone having ordinary skill in the art.

What is claimed is:

1. In a gas control device of the class described: thermally responsive means having a face portion adapted to receive actuating heat, starting pilot burner means and safety pilot burner means disposed adjacent said thermally responsive means and each ported to be effective at the same location on said face portion when operating, whereby said starting pilot burner means is in igniting relation to said safety pilot "burner means by way of said location on said face portion, electric ignition means for said starting pilot burner means, said starting pilot burner means being also ported to have ignition service by said ignition means, the porting of said safety pilot means being arranged so that its flame avoids said ignition means, means admitting gas to said starting pilot burner means and coincidently energizing said ignition means by supply of current thereto, safety pilot supply valve means operatively associated with said safety pilot burner means and arranged to be actuated by said thermally responsive means,

'Jmeans for discontinuing operation of said' start- .ing pilotburner means following ignition of said safety pilotfiburner means-and means for'deenergizing said ignition means responsive to heating of said face portion.

'2. Ina gascontrol device of the class described: thermally responsive means having a face; portion adapted to receive actuating heat, starting pilot burner means and safety pilot burnermeans disposed adjacent said therm-ally 'responsive'means. and each ported to be effective at the same locaticn'onsaid'face=pcrtion when operating, whereby said starting pilot burner means is in igniting relation to said safety pilot burner means by way ofsaid location on said faceportion, electric ignition means for said starting pilot burner'means, said startingpilot burner means being also ported to haveigniti'on service by said ignition means, the porting -'of said safety pilot'means being arranged so that its flame-avoids :said ignition means-means admitting gas to said starting pilotburner means and coincidently' energizing said ignition=means by supply of. current thereto, safety pilot supply valve means operatively associated with said safety pilotburner' means and arrangedtc'be actuated by said thermally responsive means, and. means actuable by'said thermally responsive means for discontinuing operation of said starting pilot burner means'and'deenergizing said ignition means upon operation of said safety pilot burner means.

v3. Means for the purpose described,"comprising safety pilot meansadapted to-bedisposed .in igniting relation to aburner tobe controlled,

safety pilot means andarrangedto be responsive to said thermally responsive means,--starting P lot supply valve means operatively associatedwith. said starting pilot meansym'eans forecin'cideiitly opening said "starting pilot supply valve means and energizing said ignition means, and means responsive to said thermally responsive means to close said starting pilot supply valve means and de-energize said ignition means upon operation of said safety pilot means.

4. Means for the purpose described, comprising safety pilot means adapted to be disposed in igniting relation to a burner to be controlled, starting pilot means in igniting relation to said safety pilot means, electric ignition means for said starting pilot means, thermally responsive means arranged to be heated by operation of either of said pilot means, safety pilot supply valve means operatively associated with said safety pilot means and arranged to be responsive to said thermally responsive mean-s, starting pilot supply valve means operatively associated with said starting pilot means, circuit means to energize said ignition means and manual means associated therewith to open said starting pilot supply valve means, and switch means in said circuit means responsive to said thermally responsive means to de-energize said ignition means and close said starting pilot supply valve means upon operation of said safety pilot means.

5. Means for the purpose described, comprising safety pilot means adapted to be disposed in igniting relation to a burner to be controlled, starting pilot means in igniting relation to said safety pilot means, electric ignition means for said starting pilot means, thermally responsive means arranged to be heated by operation of either of said pilot means, safety pilot supply valve means operatively associated with said safety pilot means and arranged to be responsive to said thermally responsive means, starting pilot supply valve means operatively associated with said starting pilot means, manual means to permit energization of circuit means to coincidently energize said ignition means and open said starting pilot supply valve means, and switch means in said circuit means responsive to said thermally responsive means to deenergize said ignition means and close said starting pilot supply valve means upon operation of said safety pilot means.

6. Means for the purpose described, comprising: safety pilot means adapted to be disposed in igniting relation to a main burner to be controlled, starting pilot means in igniting relation to said safety pilot means, electric ignition means for said starting pilot means, thermally responsive means arranged to be heated by operation of either of'said pilot means, safety pilot supply valve mean-s operatively associated with said safety pilot means and arranged to be respon sive to said thermally responsive means, electrically responsive starting pilot supply valve means operatively associated with said starting pilot means, electrically responsive main burner supply valve means operatively associated with said main burner, room thermostat means, transformer means having a pair of secondary portions, double throw switch means responsive to said thermally responsive means, and circuit means including means interconnecting said switch means, by way of said room thermostat means, to both said transformer secondary p01- tions to provide a starting circuit including said starting pilot supply valve means, one secondary portion of said transformer means, and one side of said switch means, an ignition circuit ineluding said ignition means, the other secondary portion of said transformer means, and the same side of said switch means, and a running circuit including said main burner supply valve means, said other secondary portion of said transformer means, and the other side of said switch means, said switch means being arranged to provide thermally responsive selective energization of either said starting and ignition circuits coincidently, or said main burner supply valve circuit.

JOSEPH A. CERNY.

NOEL B. GREEN.

REFERENCES CITED The following references are of record in the file of this patent:

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